<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <form action="http://localhost:8080/servlet_demo/servletDemo2" method="post">
    <input type="submit" value="提交表单">
  </form>

  <a href="/servlet_demo/mimeServlet?fileName=a.jpg">获取文件的mime的类型</a>
</body>
</html>